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<script>
	function createPerson(name){
		var localPerson=new Object();
		
		localPerson.name=name;
		
		return localPerson;	
	};
	var globalPerson=createPerson(888);
	console.log(globalPerson);{name:888}
	console.log(localPerson)//localPerson is not defined
	
	globalPerson=null;
	//解除一个值的引用，并不是意味着自动回收该值所占用的内存，其真正作用：让值脱离环境，以便垃圾收集器下次运行时将其回收
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